Good Swift, Bad Swift - Part 2

guard.swift

@objc func didPressLogIn(sender: AnyObject?) {
        guard !isPerformingLogIn else { return }
        isPerformingLogIn = true
        
        let email = contentView.formView.emailField.text
        let password = contentView.formView.passwordField.text
        
        guard validateAndShowError(email, password: password) else {
            isPerformingLogIn = false
            return
        }
        
        sendLogInRequest(email, password: password)
    }